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Misdivision of univalents in common wheat

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Summary

In the wheat variety Chinese Spring, misdivision of mouosome IX was observed at TI in 39·7% of microsporocytes and at TII in at least 29·3% of cells with a lagging univalent. Mono-IX from three other varieties, but with a Chinese Spring background, also showed high frequencies of misdivision, but less at TI than the Chinese mono-IX. Other Chinese monosomes likewise misdivided frequently.

Misdivision at TI resulted in the production of both telocentrics and isochromosomes. Misdivision at TII involved some of the newly produced isochromosomes as well as normal chromosomes, but there was a high frequency of loss of TII laggards. No tendency for telocentrics to misdivide and form isochromosomes was observed at the first microspore mitosis.

Genetic tests showed that in 17·8% of eggs which transmitted a chromosome IX or derivative it was an isochromosome or telocentric for the long arm which was transmitted. Since an equivalent frequency of short-arm derivatives were presumably transmitted also, there is substantial agreement with the cytological observations, if it be assumed that most of the telocentrics produced at TII are lost.

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Authors and Affiliations

  1. U. S. Department of Agriculture, Columbia, Missouri

    E. -R. Sears

  2. University of Missouri, 108 Genetics Building, Columbia, Missouri, USA

    E. -R. Sears

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  1. E. -R. Sears
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Senior Geneticist, Division of Cereal Crops and Diseases, Bureau of Plant Industry, Soils, and Agricultural Engineering, Agricultural Research Administration, U. S. Department of Agriculture; and Research Associate, Field Crops Department, University of Missouri. This work was supported in part by funds obtained under Bankhead-Jones Project SRF 2–95, “Combining in Wheat the Disease Resistance and Other Desirable Characters of Related Grass Species.” Journal Paper No. 1268 of the Missouri Agricultural Experiment Station.

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Sears, E.R. Misdivision of univalents in common wheat. Chromosoma 4, 535–550 (1950). https://doi.org/10.1007/BF00325789

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  • DOI: https://doi.org/10.1007/BF00325789

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